JSME International Journal Series A Solid Mechanics and Material Engineering
Online ISSN : 1347-5363
Print ISSN : 1344-7912
ISSN-L : 1344-7912
Deformation
New Development of the Multiple Strata Plasticity Model
Yoichi OBATAYATakamoto ITOHTakaya KATO
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2001 Volume 44 Issue 1 Pages 64-70

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Abstract

The multiple strata plasticity model, which was presented in the previous paper by introducing the tensor Q expressing the activating state of slip systems in the polycrystalline metal, has been developed with a new internal state factor B5. This factor B5 denotes the ratio of the grains with activating slip systems greater than five to the total grains. The variation features of B5 and Q can be computationally evaluated with a virtual polycrystalline specimen. The microstructure state, such as dislocation density can be reflected in the internal structure variable A in this model. The relationship between B5 and A has been examined on the tensile flow curve of pure copper. As a result, a simple formula connecting A with B5 was determined. Moreover, it has been clarified that this formula is applicable for describing the plastic deformations under other proportional loadings.

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© 2001 by The Japan Society of Mechanical Engineers
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